Quote:
Originally Posted by Terry,OH
Using the resistance of the coil Sec./Pri. will give you the approx. turns ratio. For both of the pictured examples it is about 13,500/1 . If Skips coil has a primary resistance of 0.5 Ohm you wind up with 12,300/1 . With 3 to 4 volt input, that's an approx. max. output of about 35,000V should be hot enough for a flat head.
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Pri/sec resistance doesnt give you the secondary voltage.
To be able to calculate output voltage you need the turns ration of the coil.